Changsha Xiangjia Metal Materical Co., Ltd.

The expression of   steel pipe   diameter should meet the following requirements: 1. For water and gas transportation steel pipes (galvanized or non-galvanized), cast iron pipes and other kinds line pipes, the pipe diameter should be expressed by the nominal diameter  DN (such as DN15, DN50); 2. For seamless steel pipes, welded steel pipes (straight seam or spiral seam), copper pipes, stainless steel pipes and other pipes, the pipe diameter should be expressed in terms of outer diameter D×wall thickness (such as D108×4, D159×4.5, etc.); 3. For reinforced concrete (or concrete) pipes, clay pipes, acid-resistant ceramic pipes, cylinder tile pipes, etc., the pipe diameter should be expressed by the inner diameter d (such as d230, d380, etc.); 4. For plastic pipes, the pipe diameter should be expressed accordance with the product standard method; 5. When the design uses the nominal diameter DN to indicate the pipe diameter, there should be a comparison table between the nomin...

Precision welded pipe   is the result of further processing on the basis of ordinary welded pipe. It is more accurate than the ordinary welded pipe geometry, the weld seam and the inner and outer surfaces of the precision welded pipe are of excellent quality, and the wall thickness is uniform. It is widely used in the chemical industry, textile machinery, aviation, instrumentation, automobile and other industries.  Precision Welded Pipe vs Ordinary Welded Pipe 1. Precision welded pipe geometric dimensions, uniform wall thickness, good steel pipe geometry, small ovality, reliable weld quality, small internal burrs, and smooth outer surface. After the weld heat treatment or protective atmosphere heat treatment, the steel pipe can achieve no oxidation on the surface, stable mechanical properties and uniform metallographic structure. 2. The production cost is much lower than that of the seamless precision steel pipe of the same type. It can be used on some equipment directly or af...

  Galvanized steel pipe   is a carbon steel pipe coated with zinc layer. It should be noted that the groove size and handle the nearby galvanized layer before welding. In order to weld penetration, the groove size should be 60~65°, and left 1.5~2.5mm gap. In order to reduce the penetration of zinc to the weld, the galvanized layer in the groove shoule be remove before welding to avoid air bubbles, trachoma, and false welding. The welding rod should be selected according to the base material of the galvanized steel pipe. Generally, the selection of J422 is good choice for low-carbon steel pipe due to the ease of operation. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annual will ensure the ...

SSAW steel pipe , a pipe in which the weld is helically distributed relative to the axis of the pipe body. Used for conveying pipes, pipe piles and structural pipes. Product specifications: outer diameter 300-3660mm, wall thickness 3.2-25.4mm. The characteristics of SSAW steel pipe are: 1. The same width strip can be used to produce pipes with different outer diameters; 2. The pipe has good flatness and precise dimensions. The spiral weld increase the rigidity of the pipe, so there is no need for sizing and straightening after welding; 3. Easy to realize mechanization, automation and continuous production; 4. Compared with other equipment, it has small dimensions, land occupation and investment are smaller; 5. Compared with the straight seam welded pipe of the same size, the weld of SSAW steel pipe per unit length of the pipe is longer, so the productivity is lower.

  1.       From the perspective of being suitable for offshore oil and gas transportation, it is bound to focus on the construction of LSAW. With the development of oil exploration to the depths of the ocean, due to the impact of pressure, impact and bending forces on the pipeline laying on the seabed, flattening occurs. In order to improve the pipeline transportation capacity and ensure, the submarine pipelines are developing in the direction of thick walls, so the submarine pipelines mostly use LSAW. 2.       Coal slurry and slurry pipelines need to use LSAW. The pipeline transportation of coal and mineral powder in a "paste" state is the effective upward direction. 3.       LSAW are required for machinery, construction, and chemical engineering. The valve seat of the machinery industry manufactures the valve seat. At present, the inner hole is processed by the forging part, which is time-consuming and cos...

 To reduce the hydrogen, oxygen, and nitrogen impurity gas content in the  rectangular steel pipe , the following eight measures can be considered to take in production: 1. Pay attention to the point that 80% of the hydrogen in molten steel comes from raw materials, refractories and moisture in the atmosphere. 2. In the control to reduce the [N] content in the rectangular tube, in addition to the vacuum treatment of molten steel and reducing the contact of molten steel with the atmosphere, the focus is on the control of alloy content. 3. Reasonable order of joining. The order of adding deoxidizer is as follows: before tapping, add a small amount of Fe-Mn in the ladle, add Fe-Si after tapping, and feed Al with a wire feeder when refining outside the refining station. 4. Control the slag composition, temperature, and slag amount to improve the ability of inclusions to dissolve in the slag phase. 5. Lowering PH2 can reduce the solubility of hydrogen in the rectangular tube, so va...